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MECHANICS - CASE STUDY

    Introduction


Cylindrical Gas Pressure Vessels
on Rail Car

 

A rail car needs to transport pressurized gas and due to shipping constraints, each cylinder can have only a diameter of 34 cm (inside dimension). The end caps are not considered in this initial design.

What is known:

  • Internal pressure is 10 MPa.
  • Inside diameter of a single vessel is 34 cm.
  • Yield (allowable) stress for the steel shell is 250 MPa.
  • Factor of Safety is 2.0.
  • The vessels should be designed to meet the maximum distortion energy criteria for predicting failure.
     

Dimensions
  Question

 

What is the minimum wall thickness in the cylindrical section of the gas pressure vessel?

   
  Approach

   
  • Determine the hoop and axial stresses as a function of the thickness.
  • Apply the factor of safety.
  • Use the maximum distortion energy criteria equation to determine the wall thickness.
         
     
   
 
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